US8362764B2 - Diagnosable hall sensor - Google Patents

Diagnosable hall sensor Download PDF

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Publication number
US8362764B2
US8362764B2 US12/934,384 US93438409A US8362764B2 US 8362764 B2 US8362764 B2 US 8362764B2 US 93438409 A US93438409 A US 93438409A US 8362764 B2 US8362764 B2 US 8362764B2
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diagnosis
hall
sensor device
voltage
sensor
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US20110018534A1 (en
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Andreas Peukert
Wolfgang Kliemannel
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ZF Friedrichshafen AG
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ZF Friedrichshafen AG
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
    • G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
    • G01R33/07—Hall effect devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
    • G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
    • G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices

Definitions

  • the invention relates to a measuring device for determining the position of a sensor device with a Hall probe.
  • Hall probes are known in the state-of-the-art. Generally, Hall probes comprise of a conducting sensor surface through which a feed current flows. If a magnetic field is now alternating with the sensor surface through which the current flows, a deviation of the charge carriers takes place, caused by the Lorentz force on the moving electrical charge carriers in the sensor surface, transversal to their direction of movement. Hereby, and the electric field, as well as a measurable electric voltage is created between the two edges on the sides of the sensor surface.
  • This voltage is in proportion to the product of the magnetic flow density of the magnetic field which interacts with the sensor and the feed current which flows through the surface of the sensor.
  • the magnetic flow density interacting with the sensor can be up to a proportional factor, whereby the proportional factor is mainly dependent on the geometric dimensions of the sensor surface.
  • Hall probes or Hall sensors are known, for instance, as integrated Hall sensor components, whereby a processing device follows the actual Hall sensor, which processes the Hall signal provided by the Hall sensor for analysis and generates an output signal, resulting from the Hall signal.
  • the Hall sensor, as well as the processing device, can hereby be integrated in one single enclosure.
  • Hall sensors can be used, for instance, to calculate the relative position of two mechanical components under a contact-free and wear-free position.
  • a Hall sensor is positioned at one of the two mechanical components, while a component which generates a magnetic field, preferably a permanent magnet, is positioned at the other, second mechanical part.
  • the strength and/or the angle of the magnetic field lines of the part generates a magnetic field at the location of the Hall sensor, and thus the Hall voltage which is generated by the Hall sensor. Therefore, the change of the relative position of the two mechanical parts can be registered and, in the case of respective calibration of the Hall sensor, can also be measured or quantitatively calculated, respectively.
  • the Hall sensor Basically, there is also a risk with the Hall sensor of a failure of the sensor component, for instance due to an electronic defect. It is also possible that the measured signal is distorted, for instance due to different operating temperatures, interfering, external magnetic fields, and mechanical stress which is transferred to the Hall sensor such that its sensitivity or characteristics, respectively, can change.
  • the task of the present invention to create a diagnosable sensor device with a Hall probe, or a method for the functional diagnosis of a Hall sensor device, were a comprehensive diagnosis of the sensor device can be executed.
  • the invention makes it possible to execute the diagnosis of the Hall sensor component, as well as the evaluation electronics of the Hall sensor component.
  • a qualitative and a quantitative diagnosis of the sensor device is enabled, such that calibration of the sensor device, or elimination of faulty measurements, respectively, which, for instance, occur due to changes in the ambient conditions are made possible.
  • the measuring device itself serves, as known in the art, for the determination of the field strength of a magnetic field.
  • the measuring device comprises a sensor device with at least a Hall probe.
  • the Hall probe is provided to create a Hall voltage depending on the placement of the Hall probe in the magnetic field, as well as depending on the feed current which flows through the Hall probe.
  • the measuring device is not only characterized by an electrical diagnosis conductor, galvanically isolated from the Hall probe, positioned in an immediate proximity of the Hall probe, but also by a driver device to create a certain electrical diagnosis current through the diagnosis conductor.
  • the diagnosis conductor through which a certain electrical diagnosis current is routed by means of the driver device, creates a magnetic field, caused by the diagnosis current, which is then again affecting the Hall probe.
  • a Hall voltage of a certain size is created in the Hall probe.
  • the Hall voltage which is generated by the diagnosis current can be analyzed and, based on the analysis, conclusions can be drawn in regard to the function of the Hall probe, as well as in regard to the function of the evaluation electronic of the Hall probe.
  • a correlation can also be established between the size of the diagnosis current and the size of the hereby created Hall voltage, because a certain size of the diagnosis current has a certain magnetic field strength of the diagnosis conductor associated with it, thus, also a certain nominal value is associated with this magnetic field strength and the related Hall voltage. Therefore, not only qualitative but also quantitative conclusions can be made with regard to the functionality of the Hall probe or its evaluation electronic, respectively.
  • Even calibration of the Hall probe or the measuring device can take place by calculating a corresponding correction value from the known value of the diagnosis current, the value of the hereby created Hall voltage, and from the nominal value of the Hall voltage related to the diagnosis current.
  • compensation for the temperature of the Hall probe can take place, so that the accuracy, reliability, and temperature stability of the Hall probe can be significantly improved.
  • diagnosable magnetic field sensors are created which can preferably be used in applications where, due to safety reasons, reliable detection of sensor failure is required, for instance, to prevent injuries and damage to persons or property caused when sensors fail.
  • the inventive measuring device is also capable of testing the functionality of the Hall probe and the evaluation electronics without the need for an external magnetic field as it is the case in the named state of the art.
  • the underlying magnetic field itself is created through the diagnosis conductor and the diagnosis current which provides an additional advantage, in that the field strength of the diagnosis magnetic field is known, or can be adjusted as required.
  • mechanical stress of the Hall probe can also be detected and be diagnosed, because it creates a corresponding distortion of the Hall voltage, which can be recorded, in accordance with the invention, due to the known diagnosis current and the known diagnosis magnetic field.
  • the galvanic isolation between the diagnosis conductor and the Hall probe contributes to an especially reliable diagnosis and to protection of the Hall probe from the diagnosis voltage or the diagnosis current, respectively.
  • the invention can be enabled independent of the kind and value of the diagnosis current, as long as the variables which determine the diagnosis current are known, through which also the field strength of the diagnosis magnetic field and the nominal value of the Hall voltage which is generated by the diagnosis magnetic field, can be calculated.
  • the diagnosis current shows a cyclical change of the amperage which is commonly known or the diagnosis current has an overlay of a defined, known pulse pattern.
  • the Hall voltage which is created by the Hall probe, into a measured partial voltage and a diagnostic partial voltage. This is advantageous because a complete, and if necessary, a quantitative diagnosis of the Hall probe can be executed if external magnetic fields or interfering magnetic fields of known or unknown size are present.
  • a corresponding pulse pattern can also be seen on the Hall voltage created by the Hall probe. Based on the number and especially the amplitude of the pulses in the Hall voltage, separation of a measuring signal, which has a superimposed diagnosis signal, and the measured signal itself can be performed. Especially, the amplitude of the pulses present in the Hall voltage can be measured, whereupon the basis of the measured amplitude, as well as on the basis of the known amplitude of the diagnosis current, a complete diagnosis of the measuring device or the Hall probe, respectively, can again be executed as described above.
  • the Hall probe and the diagnosis conductor are positioned together in a Hall enclosure or molded, respectively.
  • it can be a chip enclosure which accommodates the Hall probe and its measuring electronics, as well as the diagnosis conductor.
  • This has the advantage that the relative position between the diagnosis conductor and the Hall probe is exactly fixed and is non-changeable, so that calibration of the magnetic field itself, which is generated by the diagnosis conductor in the area of the Hall probe, does not have to be performed.
  • it provides optimum protection of the diagnosis conductor and an optimum handling of the sensor device.
  • the sensor device is designed as an integrated current measuring sensor.
  • the diagnosis conductor is designed with a shunt resistor or measuring shunt, respectively, which is positioned in the chip enclosure of the current measuring sensor, whereby the current measuring sensor, in this case, is not used for measuring an unknown current value, but it serves by means of a default value of a known current in form of the diagnosis current to measure a magnetic field of an unknown size, and simultaneously serves for the diagnosis of the sensor and the measuring electronic.
  • the measuring device is designed with an additional magnet that is movably positioned relative to the sensor device or the Hall probe, respectively.
  • the sensor device and the magnet are rotationally positioned to each other or movably positioned to each other, respectively.
  • the measuring device can be generally utilized to determine the relative position of two relatively moving mechanical parts, where the sensor device is positioned at one of the moving parts and the magnet is positioned at the other of the two moving parts.
  • the inventive measuring device in the area of the motor vehicle electronics, especially in actuation devices for shift-by-wire controlled change speed gear transmission of motor vehicles.
  • the Hall probe measuring devices are especially useful for low-wear and low-friction determination of shift positions of the actuating levers.
  • Such actuating devices can have—for the determination of the actual shift condition of the transmission actuation lever in the passenger compartment—a magnet positioned at the actuation lever which creates in a certain shift position a magnetic field of a determined size in the effective range of the sensor device or the Hall probe of the sensor device.
  • the inventive measuring device is used in a motor vehicle, malfunctions or a failure of the sensor device can readily be determined and diagnosed through diagnosis electronics which are present in the motor vehicle. It is also possible, by means of the diagnosis electronics which are present and the vehicle, to continually monitor the functionality of the Hall sensor device which is used in the transmission actuating device and to correct it if necessary. If malfunctions or failures of the sensor device are recognized, it is possible to signal these to the driver or to run a safety program assigned to the failure. Thus, possible incorrect actuation of the transmission can be prevented and, therefore, possible harm to the driver or damage to the vehicle can be averted.
  • the invention relates to a method for a functional diagnosis of a Hall sensor device.
  • the Hall sensor device comprises at least a Hall probe, a diagnosis conductor which is galvanically isolated from the Hall probe, as well as a driver device.
  • the driver device serves hereby for an overlay of a changeable, electric diagnosis current with any predetermined amplitude pattern on the diagnosis conductor.
  • the inventive method comprises the following described steps of the method.
  • control electronics of the sensor device generates a defined feed current which flows through the Hall probe as a prerequisite for the measurement of Hall voltages.
  • the overlay of the electric diagnosis current on the diagnosis conductor takes place in a next step of the method.
  • the order of the first two steps of this method is optional or insignificant.
  • determination of the Hall voltage which has been generated by the Hall probe takes place in a next step of the method, which then splits the Hall voltage in to the measured partial voltage and the diagnosis partial voltage.
  • the splitting of the Hall voltage into the measured partial voltage and the diagnosis partial voltage can basically take place through simple changes, because the amplitude pattern of the diagnosis current is known, thus, the nominal value on the Hall voltage, which is created by the diagnosis current, is known.
  • the measuring partial voltage of the Hall probe can therefore be determined.
  • the measured partial voltage as a measure of a magnetic field which affects the Hall probe—as well as the diagnosis partial voltage—as a measure of the magnetic field which is generated by the diagnosis current—are known and can therefore be separately analyzed in an additional step of the method.
  • the inventive method therefore enables continual diagnosis of the Hall sensor device during normal operation. Because of the overlay of the diagnosis magnetic field, generated through the diagnosis current and the diagnosis conductor, with a possible, external magnetic field, for instance from a permanent magnet and the following separation of the signal of the Hall probe into the diagnosis partial voltage and the measured partial voltage, interaction between the measured signals and the diagnosis signals is not possible.
  • the inventive method not only can a qualitative diagnosis take place, like whether the Hall sensor device properly functions or does not function, but also quantitative diagnosis can determine if the signal of the Hall probe is correct and if it is proportional to the respective present magnetic field. For that reason, the invention also enables continual monitoring and, if necessary, calibration of the Hall probe. For example, this might be required if imprecise signals occur because of temperature drift or because of mechanical stress in the Hall probe.
  • the inventive method can initially be realized independently from the amplitude pattern of the changeable electric diagnosis current, as long as the pattern is known, or can be exactly predetermined, respectively, and thus, the diagnosis partial voltage can again be differentiated from the measured partial voltage.
  • the electric diagnosis current has a pulse shaped amplitude pattern.
  • the pulse shaped amplitude pattern is especially advantageous because the pulses can be recognized, due to the steep rise and fall of the signal edges, in a simple and exact way in the output signal of the Hall probe, and can therefore reliably be separated from the measuring partial voltage.
  • the number of pulses which have been received during a predetermined time interval or the amplitude of the pulses can be analyzed, respectively.
  • the analysis of the number of pulses can hereby be performed especially within the scope of a simpler, qualitative diagnosis of the Hall sensor device, in which a failure of the sensor device can be concluded, if within a certain, determined time the same number of pulses cannot be recorded, compared to the corresponding number of pulses which were input into the diagnosis current.
  • the analysis of the pulse amplitude of the diagnosis partial voltage especially enables quantitative diagnosis, or calibration of the sensor device, respectively, as described above.
  • a magnet be positioned at a movable part relative to the sensor device.
  • a determination of the relative position between the sensor device and the magnet is performed.
  • the position of the selector lever of a speed gear change transmission of a vehicle is determined, by positioning the sensor device or magnet at a base or at the selector lever, such that during movement of the selector lever, relative movement between the sensor device and the magnet takes place.
  • This relative movement creates a change of the effective magnetic field of the magnet in the area of the sensor device or in the area of the Hall probe of the sensor device, whereby—after a respective calibration—the corresponding relative position between the selector lever and the base of the actuating device can be determined.
  • FIG. 1 a schematic view of a sensor device of a measuring device in accordance with an embodiment of the present invention
  • FIG. 2 a corresponding presentation of an embodiment as in FIG. 1 of a measuring device in accordance with the present invention
  • FIG. 3 a schematic diagram of the output voltage of the Hall probe of the measuring device in accordance with FIG. 2 in an idling condition
  • FIG. 4 a corresponding presentation as in FIG. 3 of the output voltage of the Hall probe of the measuring device in accordance with FIG. 2 and FIG. 3 during operation;
  • FIG. 5 an isometric view of a sensor device and the magnet of a measuring device in accordance with the invention.
  • FIG. 6 a corresponding presentation in accordance with FIG. 5 , showing the configuration of the sensor device and the magnet in accordance with FIG. 6 , in a bottom view.
  • FIG. 1 shows, in a highly schematically represented circuit, the sensor device 1 of a measuring device in accordance with an embodiment of the present invention
  • the Hall probe 2 can be seen, with its four edges being connected in a common way with an electronic supply and analysis circuit 3 .
  • the necessary current can be supplied to the Hall probe 2 to create the Hall effect, and when magnetic fields become present at the edges of the Hall probe 2 , which run in parallel to the feed current, the corresponding Hall voltage can be detected and registered.
  • the presented sensor devise 1 comprises a diagnosis conductor 4 , which is galvanically isolated from the Hall probe 2 and fed by a driver device 8 (not shown in FIG. 1 , compare to FIG. 2 ) in a way such that certain electric diagnosis current flows in the diagnosis conductor 4 .
  • the diagnosis current which flows through the diagnosis conductor 4 enables the creation of a magnetic field 5 around the diagnosis conductor due to the diagnosis current.
  • This magnetic field 5 penetrates also the Hall probe 2 and leads to the generation of a corresponding Hall voltage at the two edges of the Hall probe 2 , which are parallel to the feed current.
  • the Hall voltage is entered into the evaluation circuit 3 of the sensor device, amplified, and is transmitted as a corresponding signal to the output 6 of the sensor device.
  • FIG. 2 shows how the sensor device 1 in FIG. 1 is incorporated into the inventive measuring device. Besides the sensor device 1 in accordance with FIG. 1 , FIG. 2 shows a magnet 7 that is movable relative to the sensor device 1 .
  • the magnet 7 for instance, can be positioned at a selector lever of an actuation device in a speed change gear transmission, while the sensor device 1 is positioned at the enclosure or a base of the actuating device.
  • the measuring device comprises a driver device 8 , a pre-resistor shunt 9 , and control electronics 10 .
  • the control electronics 10 coordinate all the sequences which are necessary for the diagnosis of the sensor device 1 , in accordance with the invention. It includes, in the first instance, the control of the driver device 8 through a square wave signal 11 which is generated in the control electronics 10 .
  • the square wave signal 11 is amplified by the driver device 8 and is, in the form of a pulsing diagnosis current 12 , added as an overlay to the square wave amplitude pattern of the assigned diagnosis conductor 4 in the sensor device 1 .
  • the measuring device comprises a shunt 9 .
  • a control voltage 13 is established which is pulse shaped and proportionally corresponds with the pattern of the diagnosis current 12 , and which is then transferred to the control electronics 10 .
  • control electronics 10 is also connected to the output 6 of the sensor device 1 so that also the respective, amplified signal 14 of the Hall probe 2 is transferred to the control electronics 10 .
  • the output signal 14 from the sensor device 1 of the Hall probe 2 represents a summation signal 14 , which corresponds to an overlay of the magnetic fields of the magnet 7 and the diagnosis conductor 4 , which is present at the location of the Hall probe 2 .
  • the nominal diagnosis signal which is generated by the Hall probe 2 can be calculated and it can also be again eliminated or separated, respectively, from the summation signal 14 through an overlay of the summation signal 14 generated by the Hall probe 2 , which creates a pure analog signal of the Hall probe which was caused earlier by the magnet 7 .
  • FIG. 3 and FIG. 4 show examples of the summation signal 14 which was issued by the sensor device 1 , whereby the summation signal 14 , as explained above, is initially created by an overlay of the magnetic fields of the magnet 7 and of the diagnosis conductor 4 .
  • FIG. 3 shows the output voltage or the summation signal 14 , respectively, of the sensor device 1 in the condition of a standstill of the magnet 7 , relative to the sensor device 1 , also, as an example, the signal of the sensor device 1 of an actuating device in a gear speed change transmission when the actuating lever is not moved. It can be seen that the measured signal 15 , along the Y-axis, and as part of the summation signal 14 remains constant over the time. From the amplitude of the measured partial voltage 15 of the summation signal 14 , a conclusion can be drawn in regard to the distance between the magnet 7 and the sensor device 1 , in the example for the absolute position of the transmission actuation lever.
  • the pulsating diagnosis partial voltage 16 can be recognized, overlaid with the measured partial voltage 15 and resulting from the pulsating diagnosis current 12 which flows through the diagnosis conductor 4 .
  • the pulsating diagnosis partial voltage 16 can be recognized, overlaid with the measured partial voltage 15 and resulting from the pulsating diagnosis current 12 which flows through the diagnosis conductor 4 .
  • FIG. 4 shows the summation signal 14 of the sensor device 1 as it arises in the case of non-uniform movement of the magnet 7 , relative to the sensor device 1 , or in the case of corresponding movement of a transmission actuation lever which is equipped with the sensor device 1 .
  • the summation signal 14 comprises, on the one hand, the overlay of the measured partial voltage 15 , which results from the magnetic field of the magnet 7 , on the other hand, the diagnosis partial voltage 16 which results from the pulsating magnetic fields 5 of the diagnosis conductor 4 .
  • the calculated separation of the signals 15 and 16 , created by the magnet 7 or the diagnosis current 12 , respectively, can be performed and the two signals 15 and 16 can be analyzed separately.
  • determinations can be made in regard to the functionality and the calibration of the sensor device 1 , while based on the amplitude of the measured partial voltage 15 of the summation signal 14 , the distance between the magnet 7 and the sensor device 1 or the relative position of an actuation lever relative to the sensor device 1 can be calculated respectively.
  • a quantitative diagnosis or calibration of the sensor device 1 can be performed respectively. For instance, if the amplitude of the actual diagnosis signal 16 is larger than the calculated or stored nominal value of the amplitude, an appropriate correction (in this case a reduction) of the feed current which flows through the Hall probe 2 can take place, until the measured actual value of the amplitude of the diagnosis partial voltage 16 again matches with the nominal value. Therefore, for example, temperature drift of the Hall probe 2 or mechanical stress of the Hall probe 2 can be recognized and, if necessary, automatically be compensated which improves significantly the reliability and measuring accuracy of the measuring device.
  • FIGS. 5 and 6 show an additional embodiment of the measuring device in accordance with the present invention.
  • a pan shaped enclosure 17 can be seen which is preferably constructed from metal, to provide optimum shielding of the sensor device 1 against interfering fields.
  • the enclosure 17 meshes, via a bracket 18 , with a movable coupling pin 19 , the movable coupling pin 19 is connected with a selector lever (not shown) of a speed change gear transmission and therefore follows the movements of the selector lever.
  • FIG. 6 indicates that a permanent magnet 7 , shaped as a segment of a circle, is positioned in the inner part of the enclosure 17 , and is in the form of an inclined plane, with increasing thickness along its segment of circular shape.
  • the permanent magnet 7 affects the sensor device 1 , also visible in FIG. 6 , which is not connected to the enclosures 17 , but is for example, connected to a base of the actuating device (not shown here).
  • the effective distance between the permanent magnet 7 and the sensor device 1 is proportional to change in the angle of rotation of the enclosure.
  • the level of the sensor signal 14 changes, in particular the level of the measured partial voltage 15 of the sensor device, compare for instance FIG. 4 .
  • the angle of rotation position of the enclosure 17 can be determined.
  • continua separate analysis of the diagnosis partial signal 16 can be made and, if necessary, an automatic calibration of the sensor 1 can be performed, as explained above.
  • the functionality and possible failures of the sensor device 1 can be continually monitored, and if necessary, possible emergency programs can be initiated during a failure or the user can be notified accordingly.
  • the sensor device 1 in the sense of a further increase of the system availability, redundancy, and reliability, can also be double installed. Meaning in other words that at least the sensor device 1 , comprising the Hall sensor 2 and the diagnosis conductor 4 , are present in a redundant way.
  • the control electronics 10 can, due to cost reasons, be present as a single unit, whereby in this case the number of sensor contacts of the control electronics 10 —in accordance with the a dual sensor device 1 —are also doubled.
  • the invention has created a diagnosable sensor device or a method, respectively, for the functional diagnosis of a sensor device, which presents significant advantages, especially in regard to reliability and measuring accuracy.
  • the inventive sensor device and the inventive method enable the complete and continual, quantitative diagnosis and calibration of a Hall sensor component, such that measurement errors, for instance due to temperature drift or mechanical stress, can be eliminated.

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  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Magnetic Variables (AREA)
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DE102008000943.1 2008-04-02
DE102008000943.1A DE102008000943B4 (de) 2008-04-02 2008-04-02 Diagnostizierbarer Hallsensor und Verfahren zur Funktionsdiagnose einer Hall-Sensoreinrichtung
DE102008000943 2008-04-02
PCT/DE2009/050012 WO2009121352A2 (de) 2008-04-02 2009-04-02 Diagnostizierbarer hallsensor

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EP (1) EP2260315A2 (ko)
JP (1) JP5599112B2 (ko)
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